半导体产生的光子的纠缠交换违背了贝尔不等式。

Entanglement Swapping with Semiconductor-Generated Photons Violates Bell's Inequality.

机构信息

Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany.

Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany.

出版信息

Phys Rev Lett. 2019 Oct 18;123(16):160502. doi: 10.1103/PhysRevLett.123.160502.

DOI:10.1103/PhysRevLett.123.160502

PMID:31702338

Abstract

Transferring entangled states between photon pairs is essential in quantum communication. Semiconductor quantum dots are the leading candidate for generating polarization-entangled photons deterministically. Here we show for the first time swapping of entangled states between two pairs of photons emitted by a single dot. A joint Bell measurement heralds the successful generation of the Bell state Ψ^{+}, yielding a fidelity of 0.81±0.04 and violating the CHSH and Bell inequalities. Our photon source matches atomic quantum memory frequencies, facilitating implementation of hybrid quantum repeaters.

摘要

在量子通信中，光子对之间的纠缠态转移至关重要。半导体量子点是确定性地产生偏振纠缠光子的首选。在这里，我们首次展示了单个点发射的两对光子之间纠缠态的交换。联合贝尔测量预示着成功产生贝尔态 Ψ^{+}，保真度为 0.81±0.04，并违反了 CHSH 和贝尔不等式。我们的光子源与原子量子存储频率匹配，有利于混合量子中继器的实现。